Can I import an external directory of non-RC users and make the data available to all my RC users through their RC Desktop/Mobile App?

My company uses RingCentral (70+ lines). We were acquired by a company not currently using RC. We would like our RC-users to be able to view the contact details for our parent company's 2k employees. I understand we can manually import contact lists using an excel template, but does every user in my company need to kick off that manual import under their personal contacts section to be able to view the data? Is there an option to upload the data centrally by an admin and make it available able to all my RC users? As the parent company directory data changes, it doesn't seem efficient to require all 70+ RC users on my end to perform this step every couple of weeks. Is there a better way?